ENDLICH.] 



GEOLOGICAL FORMATIONS OF COLORADO. 



127 



Synopsis of the geological formations found in Colorado — Contiuaed. 



Locality. 



Eio San Miguel. 



TTncompahgre Caiion . 

 Animas Kiver 



EioPiedra 



Gunnison Kiver . 



Soutli Platte Eiver . 



Grand Eiver 



Bear Canon 



Tossils. 



Inoceramus, Qry- 

 phcea. 



Gryphcea. 



Indistinct plants 

 near top. 



SanscrfrasWke S. inir- 

 abile. Scavhites. 



Proteo'ides like P. 

 acuta. 



Indistinct plants 

 near the middle. 



Character of strata. 



White and light yellow mas- 

 sive sandstones near base. 

 Higher up heavy beds of 

 yellow sandstones. Trin 

 sandstones and carbona- 

 ceous shales near top. 



Yellow and white sandstones. 

 Some shales near the mid- 

 dle with anthracitic coal. 



Heavy white and yellow 

 sandstones at base. Thin- 

 ly bedded with shales high- 

 er up. White near top, 

 ■with some coal. 



Yellow and white sandstones. 

 Partly quartzitic. Some 

 shales near top. 



Yellow and pink sandstones 

 near base. Series of shales 

 and sandstones followed by 

 heavy white and yellow 

 sandstones near top. 



Massive yellow sandstones 

 below. Shales and shaly 

 sandstones with carbona 

 ceous matter near top. 



Light green sandstones near 

 base. Massive gray and 

 white sandstones with 

 shales near top. 



Hard,white,yellow and gray- 

 ish sandstones. Thinly 

 bedded sandstones with 

 shales near top. 



A decrease in thickness is very noticeable going from west to east. 



O <u 

 cr J^ 

 a; a 



1000 



900 



lUOO 

 900 



Gunnison Kiver . 



Roaring Fork 



Eagle River 



South Platte River. 



Pleasant Park 



Near Canyon City. . 



Bear Canon. 



Ralston Creek . 



Gray sandstones, gray and 

 greenish shales and marls 

 near base. Dark blue 

 limestones, shales and 

 sandstones near top. 



Sandstones, shales, a,nd 

 marls near base, shales 

 with some blue limestone 

 near top. 



Gray, shaly sandstones, with 

 limestones higher up. 

 Shales, marls, and lime- 

 stones near top. 



Red limestones near base. 

 AreiLaceous limestonesand 

 calcareous shales higher 

 up. 



Pink and white limestones 

 near base. Shales, sand- 

 stones, and limestones 

 near top. 



Gray and greenish marls 

 arid shales, with inter- 

 strata of sandstones and 

 linjes'ones. 



Soft red sandstones at base. 

 Alternating sandstones 

 and limestones, with some 

 shales near top. 



Red arenaceous shales and 

 argillaceous sandstones 

 near base. Variegated 

 shales, with thin strata of 

 limestones. 



960 



150 



870 



630 



